EventFilter how to ignore mouseMoveEvent when receiving QGestureEvent

Eligijus

Hello,

I have a widget and otherWidget that has implemented mouseMoveEvent. I want to catch Gesture events on otherWidget with widget so I use eventFilter. It works well but problem is that I want to ignore mouseMoveEvent when I receive pinchGestureEvent. Let's say otherWidget comes from some library that I can't change code. What is the solution here?
Now I'm getting mouseMoveEvent and QPinchGestureEvent at the same time.

Relevant code:

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

class OtherWidget;

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = 0);
    ~Widget();

protected:
    bool eventFilter(QObject *watched, QEvent *event);

private:
    OtherWidget *otherWidget;
};

class OtherWidget : public QWidget
{
    Q_OBJECT

public:
    OtherWidget(QWidget *parent = 0);
    ~OtherWidget();
protected:
    void mouseMoveEvent(QMouseEvent *event);
};

#endif // WIDGET_H

#include <QDebug>
#include <QMouseEvent>
#include <QGestureEvent>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    resize(800, 480);
    otherWidget = new OtherWidget(this);
    otherWidget->setGeometry(0, 0, 600, 480);
    otherWidget->grabGesture(Qt::PinchGesture);
    otherWidget->setAttribute(Qt::WA_AcceptTouchEvents);
    otherWidget->installEventFilter(this);
}

Widget::~Widget()
{

}

bool Widget::eventFilter(QObject *watched, QEvent *event)
{
    if (event->type() == QEvent::Gesture) {
        QGestureEvent *gestureEvent = static_cast<QGestureEvent *>(event);
        if(QGesture *tempPinch = gestureEvent->gesture(Qt::PinchGesture)) {
            QPinchGesture *pinch = static_cast<QPinchGesture *>(tempPinch);
            qDebug() << pinch->scaleFactor();
        }
        return true;
    }

    return QObject::eventFilter(watched, event);
}

OtherWidget::OtherWidget(QWidget *parent)
    : QWidget(parent)
{

}

OtherWidget::~OtherWidget()
{

}

void OtherWidget::mouseMoveEvent(QMouseEvent *event)
{
    qDebug() << event->pos();
}

taedium

@Eligijus said in EventFilter how to ignore mouseMoveEvent when receiving QGestureEvent:

Let's say otherWidget comes from some library that I can't change code. What is the solution here?

How about QObject::installEventFilter? Move your Widget::eventFilter into separate class and then invoke installEventFilter(eventFilterClassObject) on Widget.

Paraddi

Refer https://stackoverflow.com/questions/29838086/how-to-disable-mouseevent-during-pinch-zoom for more details.